单向SiC/SiC复合材料拉伸行为模拟研究  

Numerical Investigation on Tensile Behavior of Unidirectional SiC/SiC Composites

作　　者：任金伟 宋有贺 徐洁[2] 王剑浩 张方舟 李爱军[2] REN Jinwei;SONG Youhe;XU Jie;WANG Jianhao;ZHANG Fangzhou;LI Aijun(Xi’an Aviation Brake Technology Co.,Ltd.,Xi’an 713106,China;Shanghai University,Shanghai 200444,China)

机构地区：[1]西安航空制动科技有限公司,西安713106 [2]上海大学,上海200444

出　　处：《航空制造技术》2023年第8期86-92,123,共8页Aeronautical Manufacturing Technology

摘　　要：理解单向SiC/SiC复合材料在拉伸过程中的损伤破坏机制对掌握SiC/SiC复合材料的力学行为有着至关重要的意义。本文构建了一个单向SiC/SiC复合材料微观二维有限元模型,基于强度判定模拟纤维随机断裂过程;基于内聚力模型模拟界面脱粘现象;特别针对基体裂纹现象,通过均匀质方法和断裂能释放率建立了基体的连续介质损伤模型。结果显示,模型成功模拟了单向SiC/SiC复合材料在拉伸过程中的微观破坏机制和宏观力学行为。基体裂纹、纤维断裂、界面脱粘这3种微观破坏机制之间共同作用、相互影响,最终造成了材料整体的失效。本文中获得的结果将有助于进一步理解单向SiC/SiC复合材料拉伸行为,有利于材料性能的提高。It is important to understand the damage and failure mechanism of unidirectional SiC/SiC composites during tensile process for mastering the mechanical behavior of SiC/SiC composites.In this paper,the tensile behavior of unidirectional SiC/SiC composite materials was investigated via a two-dimensional microscale finite element model.The random fracture process of fibers was simulated by strength judgment;The interface debonding phenomenon was modeled using the cohesive zone model;A continuous medium damage model for the matrix was established through the uniform mass method and fracture energy release rate,specifically targeting the phenomenon of matrix cracks.The model successfully simulated the microscale failure mechanism and macroscale mechanical behavior of unidirectional SiC/SiC composite materials in a tensile process.The three microscale damage mechanisms interact and eventually caused the final failure of the entire composite material.The results obtained in this paper might deepen the understanding on the tensile behavior of unidirectional SiC/SiC composite materials.

关 键 词：单向SiC/SiC复合材料 拉伸行为 有限元模拟 基体裂纹 

分 类 号：TB332[一般工业技术—材料科学与工程]